Underfloor heating with district heating: operation, benefits and smart tips
How does underfloor heating with district heating work?
Underfloor heating and district heating complement each other well, but they operate differently compared to a traditional central heating system.
With district heating, heat is generated centrally and delivered to buildings through an underground network. The heat does not come from an individual boiler but from sources such as:
- Residual heat from industry or data centers
- Waste incineration
- Geothermal energy
- Heat pumps or combined heat and power systems
In the building, heat enters through a heat interface unit (HIU). This compact installation converts the hot water from the district heating network, often between 70 and 90°C, into usable heat for the internal system.
With underfloor heating, warm water flows through pipes embedded in the floor, typically at a lower temperature between 30 and 45°C. This ensures an even and comfortable heat distribution.
Because district heating water is hotter than required for underfloor heating, a mixing or control unit is needed to reduce the temperature.
Technical system setup
A standard combination of district heating and underfloor heating consists of:
1. Heat interface unit (HIU)
Receives hot water from the network and transfers heat to the internal system
2. Manifold with pump and mixing valve
Regulates water temperature and ensures circulation
3. Thermostat or control unit
Measures room temperature and controls heat demand
4. Floor piping system
Distributed across zones or rooms for even heat distribution
In larger buildings or apartment complexes, multiple HIUs and zones may be connected, each with their own control system.
Benefits of underfloor heating with district heating
- High energy efficiency
Low supply temperatures make underfloor heating highly efficient, reducing heat loss and energy costs - Comfortable heating
Heat rises evenly from the floor, creating a stable and pleasant indoor climate - Sustainable and future-proof
Underfloor heating works well with renewable sources such as geothermal energy and heat pumps, often used in modern heat networks - Space saving
No visible radiators or convectors, ideal for modern and sustainable buildings - Smart integration with energy management systems
With an energy management system such as Aurum EnergyGrip, underfloor heating can be controlled based on data such as occupancy, temperature and energy prices.
Key considerations for installation and use
Although the combination works well, there are several important considerations for design, management and use:
1. Temperature control
Since district heating often delivers high temperatures, the mixing system must be properly configured. Water that is too hot can lead to inefficiency or damage to the floor
2. Slow response time
Underfloor heating responds slowly to temperature changes. A stable temperature setting is more efficient than frequent adjustments
3. Return temperature
A high return temperature indicates low efficiency. Monitoring supply and return temperatures helps optimise system performance
4. Control technology
Not all thermostats are suitable for district heating or low-temperature systems. Choose a smart thermostat that works with the HIU or EMS
5. Maintenance and balancing
Underfloor heating systems must be properly balanced and regularly checked for air or contamination to maintain optimal performance
Underfloor heating in collective systems and real estate
For property managers and housing associations, underfloor heating combined with district heating offers significant advantages, but it also requires proper management and data transparency.
With smart metering and monitoring solutions, you can:
- Track consumption per dwelling or zone
- Optimise return temperatures
- Detect deviations or faults early
- Allocate costs fairly based on billing data
Read also: billing data, fair and efficient energy cost allocation for businesses
Underfloor heating thus evolves from a passive system into an active part of energy management.
Smart energy management with data
With the introduction of the collective heat act in 2026, requirements for transparency and efficiency are becoming stricter.
Smart data processing is therefore essential:
- Municipalities and heat companies must report on performance and CO₂ emissions
- Property managers must provide insight into consumption and cost allocation
- Residents expect clarity on costs and comfort
An integrated system, such as Aurum EnergyGrip, connects all measurement points, analyses the data and translates it into actionable insights. This helps structurally reduce heat loss and unnecessary heating costs.
Conclusion: comfort and efficiency with smart underfloor heating
Underfloor heating and district heating together form a comfortable, sustainable and energy-efficient combination.
With the right settings, smart control technology and data-driven monitoring, both residents and operators benefit from stable heat, lower costs and better insights.
The future of heat supply lies in transparency and automation. Those who invest in smart control and monitoring today will maximise the efficiency of both underfloor heating and district heating.
Want to know how your real estate can benefit from underfloor heating with district heating?
Frequently asked questions about underfloor heating with district heating
Can underfloor heating be connected to district heating?
Yes, this is entirely possible. A mixing or control unit is required to reduce the water temperature.
Is underfloor heating with district heating energy efficient?
Yes, due to low supply temperatures and even heat distribution, the system operates efficiently.
Which thermostat is suitable?
A smart thermostat or energy management system that supports district heating and low-temperature control.
What are the disadvantages?
Slow heating response, higher installation costs and the need for proper coordination between the HIU and the floor heating manifold.
How can I use the system optimally?
Keep the temperature stable, monitor return temperatures and use data to track and improve performance.